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Pore size control through benzene vapor deposition on activated carbon

Authors
Kang, Hyun UkKim, Wun-gwiKim, Sung Hyun
Issue Date
15-10월-2008
Publisher
ELSEVIER SCIENCE SA
Keywords
Activated carbon; Chemical vapor deposition; Adsorption; Diffusion
Citation
CHEMICAL ENGINEERING JOURNAL, v.144, no.2, pp.167 - 174
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL ENGINEERING JOURNAL
Volume
144
Number
2
Start Page
167
End Page
174
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/122557
DOI
10.1016/j.cej.2008.01.017
ISSN
1385-8947
Abstract
Carbon adsorbents are considered as prime material to separate oxygen and nitrogen in PSA process. It is known that selectivity of carbon adsorbents can be added by adjusting pore size on the adsorbents. Among many treatment methods. chemical vapor deposition method was selected and benzene was used as a chemical agent. Activated carbons were heated at 5 degrees C/min and 10 degrees C/min in inert condition. The peak temperature at 700 degrees C and 800 degrees C was maintained while activated carbons were treated with benzene vapor. Inert condition was given as laminar and turbulent flow conditions. Pore size distribution results investigated by adsorption of various gases including CO(2) (3.3 angstrom), n-butane (4.3 angstrom) and iso-butane (5.0 angstrom), assured of the pore constriction or heightened energy barrier on the pore opening. The nitrogen diffusivity and the selectivity of treated samples are inversely proportioned. That means selectivity comes out, when pore mouth is well blocked, not to admit the nitrogen Molecules. (C) 2008 Elsevier B.V. All rights reserved.
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